| 摘要 |
FIELD: construction. ^ SUBSTANCE: first version is characterised by the fact that cover with sleeve is hingedly fixed on external side of coaming. Guides are fixed on lower side, in which rods are movably installed, every of which is hingedly joined to slider. Poppet sleeve is movably installed in each guide to interact with coaming, being hingedly attached to adjacent rod. On opposite sides of sleeve wall there are grooves arranged, in which rods are movably installed. Other versions specify various arrangement of manholes. ^ EFFECT: improved reliability of their operation under conditions of high sign-changing loads and simplification of their designs. ^ 5 cl, 22 dwg
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